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<p>Kushiro Colliery, located in eastern Hokkaido, is Japan’s only underground coal mine and plays a critical role in ensuring a stable coal supply to the region. The mine primarily utilizes the room-and-pillar mining method, in which pillars support roadways to manage the overburden load. However, the roadways often undergo significant deformation due to mining-induced disturbances and the creep behavior of the coal seam, which severely disrupts the mining schedule. This study aims to develop a novel method for estimating roadway deformation over time to facilitate effective maintenance planning. The proposed approach integrates elastoplastic stress analysis with in-situ parameter calibration. Specifically, the elastoplastic stress analysis was conducted using the three-dimensional displacement discontinuity method (DDM), incorporating a newly implemented elastoplastic analysis scheme and accounting for the creep failure of coal elements. In-situ parameter calibration for the Jobu Right No. 2 Room was performed by comparing the observed and simulated roadway convergence and the normal stress at the backfilled section. Subsequent simulations of mining operations in the Jobu Left No. 3 Room A, using the calibrated parameters, demonstrated that the predicted roadway deformation closely aligned with observed values, validating the accuracy of the parameters. Furthermore, a method to mitigate roadway deformation by accelerating the dehydration of backfilling material was proposed. The proposed approach provides a reliable and practical framework for predicting and mitigating roadway deformations, thereby enhancing the safety and cost-effectiveness of mining operations.</p>

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Roadway Deformation of Room-and-Pillar Mining at Kushiro Colliery, Japan

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Zheng Li,
  • Yoshiaki Fujii,
  • Hiroyuki Matsumoto,
  • Nevaid Dzimunya,
  • Jun-ichi Kodama,
  • Tamotsu Kiyama,
  • Badrul A. K. M. Alam

摘要

Kushiro Colliery, located in eastern Hokkaido, is Japan’s only underground coal mine and plays a critical role in ensuring a stable coal supply to the region. The mine primarily utilizes the room-and-pillar mining method, in which pillars support roadways to manage the overburden load. However, the roadways often undergo significant deformation due to mining-induced disturbances and the creep behavior of the coal seam, which severely disrupts the mining schedule. This study aims to develop a novel method for estimating roadway deformation over time to facilitate effective maintenance planning. The proposed approach integrates elastoplastic stress analysis with in-situ parameter calibration. Specifically, the elastoplastic stress analysis was conducted using the three-dimensional displacement discontinuity method (DDM), incorporating a newly implemented elastoplastic analysis scheme and accounting for the creep failure of coal elements. In-situ parameter calibration for the Jobu Right No. 2 Room was performed by comparing the observed and simulated roadway convergence and the normal stress at the backfilled section. Subsequent simulations of mining operations in the Jobu Left No. 3 Room A, using the calibrated parameters, demonstrated that the predicted roadway deformation closely aligned with observed values, validating the accuracy of the parameters. Furthermore, a method to mitigate roadway deformation by accelerating the dehydration of backfilling material was proposed. The proposed approach provides a reliable and practical framework for predicting and mitigating roadway deformations, thereby enhancing the safety and cost-effectiveness of mining operations.